Showtime unveils trailers for 'Ray Donovan', 'Masters of Sex' - watch

Showtime has released trailers for new series Ray Donovan and Masters of Sex.

Ray Donovan follows Liev Schreiber as a "fixer" who solves the problems of the elites living in Los Angeles. However, Donovan can't seem to fix his family problems, which get worse when his father (Jon Voight) is suddenly released from prison.

The series also features an all-star cast, including Elliott Gould, Paula Malcomson, Eddie Marsan, Dash Mihok and Katherine Moennig.

Masters of Sex stars Michael Sheen and Lizzy Caplan as William Masters and Virginia Johnson, the real-life pioneers of the study of human sexuality.

Caitlin Fitzgerald, Nicholas D'Agosto, Teddy Sears, Beau Bridges and Margo Martindale also star in Masters of Sex, which is an adaptation of Thomas Maier's book Masters of Sex: The Life and Times of William Masters and Virginia Johnson, The Couple Who Taught America How to Love.